Bonjour;
A=
21x² -56x -15x +40 -10x² +18x
= 11x² -53x +40
B=
(10x-4) ( 5x+7 -3x+6)
= (10x-4) ( 2x +13)
C
11x-6 = 8x -20
1x-8x = -20+6
-7x = -14
x = -14/-7
x= 14/7
x= 2
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Bonjour;
A=
21x² -56x -15x +40 -10x² +18x
= 11x² -53x +40
B=
(10x-4) ( 5x+7 -3x+6)
= (10x-4) ( 2x +13)
C
11x-6 = 8x -20
1x-8x = -20+6
-7x = -14
x = -14/-7
x= 14/7
x= 2